{"id":"CVE-2026-103090","state":"PUBLISHED","title":"Unauthenticated Biscuit Credential Disclosure via GET /enroll/status in Google OSS Agent Mesh (SAM)","description":"Missing Authentication for Critical Function (CWE-306) and Insufficiently Protected Credentials (CWE-522) in the control plane enrollment status handler (HandleEnrollStatus at GET /enroll/status in internal/controlplane/server.go) in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.8 allow an unauthenticated remote attacker to retrieve an approved bootstrap-enrolled peer's signed Biscuit identity token by supplying a peer_id obtainable from the unauthenticated GET /info endpoint. A related flaw in POST /enroll allowed any bootstrap-token holder to re-fetch another peer's credential. An attacker can replay the disclosed Biscuit token as a bearer credential on /policies to read mesh authorization policies and on /routers/lease to overwrite advertised router multiaddrs. Users should upgrade to version 0.1.0-alpha.9 or later, which requires cryptographic proof of possession of the enrollment private key on credential-releasing endpoints, enforces rate limiting, and validates router lease addresses.","publishedAt":"2026-10-21T22:16:59.777Z","updatedAt":"2026-10-30T17:26:26.361Z","severity":{"score":8.8,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N","source":"Google"},"assigner":"Google","products":["Google SAM"],"affected":[{"vendor":"Google","product":"SAM","packageName":"github.com/google/sam","defaultStatus":"unaffected","versions":[{"version":"0.1.0-alpha.1","status":"affected","lessThan":"0.1.0-alpha.9","versionType":"semver"}]}],"references":["https://github.com/google/sam/security/advisories/GHSA-hp3x-79wr-rx66","https://github.com/google/sam/releases/tag/v0.1.0-alpha.9","https://github.com/google/agentmesh/security/advisories/GHSA-hp3x-79wr-rx66"],"weaknesses":["CWE-306","CWE-522"],"ingestedAt":"2026-10-30T17:38:06.351Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/103xxx/CVE-2026-103090.json","commit":"498cf57c077bfdf2c183c49552b5a5184d85cd64","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-103090","state":"PUBLISHED","datePublished":"2026-10-21T22:16:59.777Z","dateUpdated":"2026-10-30T17:26:26.361Z","assignerShortName":"Google","assignerOrgId":"14ed7db2-1595-443d-9d34-6215bf890778","dateReserved":"2026-09-30T01:36:22.449Z"},"containers":{"cna":{"title":"Unauthenticated Biscuit Credential Disclosure via GET /enroll/status in Google OSS Agent Mesh (SAM)","descriptions":[{"lang":"en","value":"Missing Authentication for Critical Function (CWE-306) and Insufficiently Protected Credentials (CWE-522) in the control plane enrollment status handler (HandleEnrollStatus at GET /enroll/status in internal/controlplane/server.go) in Google OSS Agent Mesh (SAM) versions 0.1.0-alpha.1 through 0.1.0-alpha.8 allow an unauthenticated remote attacker to retrieve an approved bootstrap-enrolled peer's signed Biscuit identity token by supplying a peer_id obtainable from the unauthenticated GET /info endpoint. 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